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Patent US10316139
Issued 2019-06-11
Aliphatic-aromatic Biodegradable Polyester
Disclosed are aliphatic-aromatic biodegradable polyesters obtained from aliphatic dicarboxylic acids, polyfunctional aromatic acids of renewable origin and particularly 2,5-furan dicarboxylic acid, and diols. Also disclosed are blends of the polyesters with other biodegradable polymers of either natural or synthetic origin. The polyesters have properties and viscosity values that make them suitable, after adjusting their molecular weight, for use in numerous practical applications such as films, injection molded products, extrusion coatings, fibers, foams, thermoformed products, extruded profiles and sheets, extrusion blow molding, injection blow molding, rotomolding, stretch blow molding.
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USPTO Full Text Publication >
- 1. A biodegradable polyester of the aliphatic-aromatic type obtained from at least one aliphatic dicarboxylic acid or ester thereof, a diol and at least one polyfunctional aromatic acid or ester thereof, wherein said polyfunctional aromatic acid is 2,5-furan dicarboxylic acid of renewable origin, and said diol consists of 1,4-butanediol, the molecular weight Mn of the polyester is between 5,000 and 150,000, and the amount of the 2,5-furan dicarboxylic acid or ester thereof is from 40% to 70% of the total molar content of dicarboxylic acids or esters thereof and the amount of the at least one aliphatic dicarboxylic acid or ester thereof is correspondingly from 60% to 30% of the total molar content of dicarboxylic acids or esters thereof, wherein said biodegradable polyester has a biodegradability greater than 90% after 150 days compared to the biodegradability of cellulose.
